<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>足球圈 - 登录</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        /* 640px设计稿下，1rem = 100px */

        .title {
            text-align: center;
            height: 1.375rem;  /* 137.5px */
            line-height: 1.375rem;
            font-size: 0.5313rem;  /* 53.13px */
            background-color: #0dc441;
            color: #fff;
            margin-bottom: .3906rem;
            width: 100%;
        }

        .login-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        form {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-direction: column;
        }

        .form-group {
            margin-bottom: .7813rem;

        }

        ::placeholder{
            color: rgb(202, 202, 202);
        }

        .form-group input {
            width: 9.0625rem;
            height: .7813rem;  /* 100px */

            border: .0133rem solid transparent;
            border-bottom: 0.013333rem solid #000;  /* 1px */
            font-size: .375rem;  /* 24px */
        }

        .login-btn {
            width: 9.0625rem;
            height: 1.4rem;
            background: #0dc441;
            color: white;
            border: none;
            font-size: 0.48rem;
        }

        .other-options {
            width: 9.0625rem;
            font-size: 0.373333rem;  /* 37.3333px */
            color: #666;
            margin-bottom: 0.4rem;
        }
        .other-options span{
            color: rgb(153, 153, 153);
        }

        .other-options a {
            color: #0dc441;
        }

        .form-group input:focus {
            outline: none;
        }
    </style>
    <script src="../js/lib-flexible.js"></script>
</head>
<body>
    <div class="login-container">
        <form>
            <div class="title">足球圈 - 登录</div>
            <div class="form-group username-group">
                <input type="text" placeholder="用户名/手机号">
            </div>
            <div class="form-group password-group">
                <input type="password" placeholder="密码">
            </div>
            <div class="other-options">
                <span>还没有账号？点击此处立即</span>
                <a href="#">注册</a>
            </div>
            <button type="submit" class="login-btn">登录</button>
        </form>
    </div>
</body>
</html>